The Charlotte, North Carolina-based bank also said it will limit prepayment penalties and offer enhanced protections on interest-only and "hybrid" adjustable-rate mortgages. The latter carry fixed interest rates for a period of time, typically five years, and then adjust.

Bank of America will continue to offer loans eligible for purchase by mortgage financiers such as Fannie Mae and Freddie Mac , as well as adjustable-rate mortgages, and mortgages with a 10-year minimum interest-only period.

"We recognize this tightening, by definition, restricts the availability of credit to some borrowers," said Bruce Hammonds, Bank of America's global consumer credit executive. "However, this will help ensure that those who get loans can afford to repay them."

Bank of comes as several analysts trimmed price targets for the company's stock and shares were recently trading lower, down 1.6%, or 59 cents, at $37.02,

In January, Bank of America agreed to buy Countrywide , in a transaction valued Monday at about $4 billion. Many critics have said lending practices at Calabasas, California-based Countrywide were a major contributor to the nation's housing crisis.

The U.S. Federal Reserve Tuesday is holding in Chicago the first of three public hearings concerning the planned purchase. The Fed also scheduled hearings for April 28 and 29 in Los Angeles. Bank of America expects to close the merger in the third quarter.